# Java Data Types: Exercises, Practice, Solution

## Java Data Types Exercises [15 exercises with solution]

[*An editor is available at the bottom of the page to write and execute the scripts.*]

**1.** Write a Java program to convert temperature from Fahrenheit to Celsius degree. Go to the editor

*Test Data*

Input a degree in Fahrenheit: 212

*Expected Output*:

212.0 degree Fahrenheit is equal to 100.0 in Celsius

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**2.** Write a Java program that reads a number in inches, converts it to meters. Go to the editor

Note: One inch is 0.0254 meter.

*Test Data*

Input a value for inch: 1000

*Expected Output* :

1000.0 inch is 25.4 meters

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**3.** Write a Java program that reads an integer between 0 and 1000 and adds all the digits in the integer. Go to the editor

*Test Data*

Input an integer between 0 and 1000: 565

*Expected Output* :

The sum of all digits in 565 is 16

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**4.** Write a Java program to convert minutes into a number of years and days. Go to the editor

*Test Data*

Input the number of minutes: 3456789

*Expected Output* :

3456789 minutes is approximately 6 years and 210 days

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**5.** Write a Java program that prints the current time in GMT. Go to the editor

*Test Data*

Input the time zone offset to GMT: 256

*Expected Output*:

Current time is 23:40:24

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**6.** Write a Java program to compute body mass index (BMI). Go to the editor

*Test Data*

Input weight in pounds: 452

Input height in inches: 72

*Expected Output*:

Body Mass Index is 61.30159143458721

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**7.** Write a Java program to takes the user for a distance (in meters) and the time was taken (as three numbers: hours, minutes, seconds), and display the speed, in meters per second, kilometers per hour and miles per hour (hint: 1 mile = 1609 meters). Go to the editor

*Test Data*

Input distance in meters: 2500

Input hour: 5

Input minutes: 56

Input seconds: 23

*Expected Output* :

Your speed in meters/second is 0.11691531

Your speed in km/h is 0.42089513

Your speed in miles/h is 0.26158804

**8.** Write a Java program that reads a number and display the square, cube, and fourth power. Go to the editor

*Expected Output*:

Square: .2f

Cube: .2f

Fourth power: 50625.00

**9.** Write a Java program that accepts two integers from the user and then prints the sum, the difference, the product, the average, the distance (the difference between integer), the maximum (the larger of the two integers), the minimum (smaller of the two integers). Go to the editor

*Test Data*

Input 1st integer: 25

Input 2nd integer: 5

*Expected Output* :

Sum of two integers: 30

Difference of two integers: 20

Product of two integers: 125

Average of two integers: 15.00

Distance of two integers: 20

Max integer: 25

Min integer: 5

**10.** Write a Java program to break an integer into a sequence of individual digits. Go to the editor

*Test Data*

Input six non-negative digits: 123456

*Expected Output* :

1 2 3 4 5 6

**11.** Write a Java program to test whether a given double/float value is a finite floating-point value or not. Go to the editor

Click me to see the solution

**12.** Write a Java program to compare two given signed and unsigned numbers. Go to the editor

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**13.** Write a Java program to compute the floor division and the floor modulus of the given dividend and divisor. Go to the editor

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**14.** Write a Java program to extract the primitive type value from a given BigInteger value. Go to the editor

A primitive type is predefined by the language and is named by a reserved keyword. Primitive values do not share state with other primitive values. The eight primitive data types supported by the Java programming language are byte, short, int, long, float, double, Boolean and char.

BigInteger() translates the sign-magnitude representation of a BigInteger into a BigInteger. The sign is represented as an integer signum value: -1 for negative, 0 for zero, or 1 for positive. The magnitude is a byte array in big-endian byte-order: the most significant byte is in the zeroth element. A zero-length magnitude array is permissible, and will result in a BigInteger value of 0, whether signum is -1, 0 or 1.

**15.** Write a Java program to get the next floating-point adjacent in the direction of positive and negative infinity from a given float/double number. Go to the editor

**Java Code Editor:**

**More to Come !**

**Do not submit any solution of the above exercises at here, if you want to contribute go to the appropriate exercise page.**

## Java: Tips of the Day

** Different between parseInt() and valueOf() in java?**

Well, the API for Integer.valueOf(String) does indeed say that the String is interpreted exactly as if it were given to Integer.parseInt(String). However, valueOf(String) returns a new Integer() object whereas parseInt(String) returns a primitive int.

If you want to enjoy the potential caching benefits of Integer.valueOf(int), you could also use this eyesore:

Integer k = Integer.valueOf(Integer.parseInt("123"))

Now, if what you want is the object and not the primitive, then using valueOf(String) may be more attractive than making a new object out of parseInt(String) because the former is consistently present across Integer, Long, Double, etc.

Ref: https://bit.ly/3vRuIPY

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